The Syrian delegation at a Non-Aligned Movement summit in Tehran Thursday walked out during a speech by Egyptian President Mohamed Morsy, who described the Syrian government as “oppressive,” Al Jazeera television reported.

The Arabic satellite channel did not give further details in its brief headline and it was not immediately clear if the delegation returned after Morsy’s speech finished.

Morsy criticized the government of Syrian President Bashar Assad in his speech at the summit being held in Iran, a steadfast ally of Assad. Morsy said it was an “ethical duty” to support the Syrian people against the “oppressive regime” in Damascus.

“We all have to announce our full solidarity with the struggle of those seeking freedom and justice in Syria, and translate this sympathy into a clear political vision that supports a peaceful transition to a democratic system of rule that reflects the demands of the Syrian people for freedom.”